Help, Guides, and News on making the Switch To Apple Macintosh Computers
The update comes shortly after the September 27, 2006 release of version 6.0, the first universal binary application that Microsoft had developed for Mac OS X. The update should resolve sign-in issues that many users experienced following the upgrade to version 6.0 while maintaining the features for version 6.0
You can read about the update at the MacBU blog or at Microsoft's Messenger for Mac page. You can obtain the download here.